during the summer when it is almost entirely used for irrigation, 

 there being several channels for this purpose o A reservoir control 

 dam 60 feet high located 12 miles upstream is a total harrier to 

 fish» This stream formerly supported good salmon and steelhead 

 runs. There are now no runs reported in this creek and there is 

 little chance for stream improvements. 



4Go •pmptanum Creek .— (July 1, 1936 j Shjman and Kolloen.) 

 Enters the Yakima 121 miles upstream. It is 16 miles long, the 

 lower "^06 miles having been surveyed to an impassable 35 foot 

 falls. About 1/2 mile upstream an irrigation ditch diverts 

 during high water stages. At a point 3/4 mile up a wing dam 

 diverts all of the flow into an unscreened ditch during periods 

 of low water, and the stream was dry for 150 yards below the dam. 

 Another dam l/2 mile farther upstream diverts water into an open 

 irrigation ditch during the spring high water period. The stream 

 has a small svnner flow and fairly high water temperatures. There 

 is some spawning area present, but most of it is inaccessible and 

 of little possible value because of the dams and diversions. A 

 good run of silver salmon was formerly reported in t?iis stream 

 before the Pomona Dam was built on the Yakima, but there have been 

 no runs of migratory fish in recent years. 



4H. Wilson Creek . — (April 20, 1936 1 Whiteleather and Shuman.) 

 This creek now enters the Yakima 131 miles upstream. There were 

 formerely two or three tributaries to the Yakima in this area, but 

 they were diverted for irrigation purposes, and are now part of 

 the Wilson Creek system. This creek now receives water from the 

 Colockum ridge flume, from the ditched channels of Naneum , Cherry, 

 and Coleman Creeks, and from the Tjossem Mill ditch near the mouth 

 of the stream. The upper parts of the creeks have clear v;ater and 

 support small trout populations, but salmon and steelhead have not 

 been known to enter the system for many years, and it is so thoroughly 

 utilized for irrigation purposes that it is of no possible value for 

 anadromous fish. 



41. Manas tash Creek . — (June 24 to 28, 1936 j Shuman and Kolloen.) 

 Enters the Yakima River opposite Ellensburgj, Washington. It extends 

 for 29 miles to the forks, the lovrer 23 miles having been surveyed. 

 The stream splits into two channels 5 miles above the mouth. The 

 south channel again splits into two channels, wMch empty into the 

 Yakima about a mile apart. The gradient is slight in the channels 

 on the flat Yakima Valley bottom, but increases upstroam. The lower 

 11 miles of this creek have been taken over almost entirely for 

 irrigation purposes, there being 44 iinscreened irrigation diversions 

 present. Nearly half of these ditches have diversion dams of one 

 type or another, although few would be barriers to fish if there were 

 good sustained stream flows. In the upper 10 miles sui-Treyed there 

 were some fine spawning riffles, occasional pools, and good covero- 

 Thr-ee lovi falls we_^re found, but they would not interfere with fish 

 except at very low water stages. Beaver dams have ponded several 



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